I'm expecting someone on it and I cannot get status from anywhere - Malev would not pick up the phone, the flight is not listed on the arrivals page on JFK, and most online flight trackers don't seem to have Malev at all.

Left LHR just after 4 pm local... don't know which direction it was heading...
Maybe it was fixed and waited for the pax to come in off flights from JFK then switch to the 767 and then carry on to BUD.